Let's solve
Q.3 and
Q.4 step by step.
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✔ Q.3: Label the parts of the human respiratory system on the diagram below.
We are given a list of structures to label:
- Throat
- Bronchi
- Bronchiole
- Larynx
- Trachea
- Lungs
- Mouth
- Epiglottis
- Nose
- Nasal cavity
- Alveoli
- Esophagus
Now, let’s match each part to its correct location in the diagram based on anatomy.
#### Step-by-step labeling (from top to bottom):
1.
Nose – The external opening at the top of the face.
2.
Nasal cavity – Inside the nose; air passes through here.
3.
Mouth – The oral opening below the nose.
4.
Throat – Also called the pharynx; common passage for air and food.
5.
Epiglottis – Flap that covers the larynx during swallowing (located just above the larynx).
6.
Larynx – Voice box; located below the throat.
7.
Trachea – Windpipe; extends from larynx down into the chest.
8.
Bronchi – Two main branches from trachea entering each lung.
9.
Bronchiole – Smaller branches of bronchi inside the lungs.
10.
Lungs – Large organs on either side of the heart.
11.
Alveoli – Tiny air sacs in the lungs where gas exchange occurs (shown in magnified inset).
12.
Esophagus – Tube behind the trachea that carries food to the stomach.
> Note: The
esophagus is not part of the respiratory system but runs parallel to the trachea and is shown here because it shares space with the airway.
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#### Final Labels (based on positions in the diagram):
-
Top left: Nose
-
Below Nose: Nasal cavity
-
Right side, near mouth: Mouth
-
Middle of neck, behind tongue: Throat (pharynx)
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Just below throat, flap-like: Epiglottis
-
Below epiglottis: Larynx
-
Long tube down the neck: Trachea
-
Splitting into two branches into lungs: Bronchi
-
Smaller branches within lungs: Bronchiole
-
Large organs in chest: Lungs
-
Magnified inset (tiny sacs): Alveoli
-
Tube running behind trachea: Esophagus
> So, fill in the blanks accordingly.
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✔ Q.4: Where is the site of gas exchange in the lungs?
Answer: c) Alveoli
#### Explanation:
- Gas exchange (oxygen entering blood, carbon dioxide leaving) happens in the
alveoli, which are tiny air sacs in the lungs.
- These alveoli are surrounded by capillaries, allowing diffusion of gases between air and blood.
- The
larynx,
trachea, and
bronchi are passageways — they conduct air but do not participate directly in gas exchange.
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✔ Final Answers:
#### Q.3: Labels (from top to bottom/left to right):
1.
Nose
2.
Nasal cavity
3.
Mouth
4.
Throat
5.
Epiglottis
6.
Larynx
7.
Trachea
8.
Bronchi
9.
Bronchiole
10.
Lungs
11.
Alveoli (in inset)
12.
Esophagus
#### Q.4:
c) Alveoli
✔ This is the correct site of gas exchange.
Parent Tip: Review the logic above to help your child master the concept of respiratory system worksheet high school.
